1. Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer
Strasse 40, 01187 Dresden, Germany
2. CAS Key Laboratory of Energy-Conversion
Materials, Chinese Academy of Sciences, Shanghai Institute of Ceramics 1295 Dingxi Road, 200050 Shanghai, China
3. University of Chinese Academy of Sciences, 19 Yuquan Road, 100049 Beijing, P. R. China